Dr. Dobb's is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Channels ▼


eXtremeDB Data Relay

McObject, provider of the eXtremeDB product family of real-time database management system (DBMS) software, has released its new Data Relay technology as a key building block for fast and flexible data-sharing between real-time applications based on eXtremeDB, and external systems such as an enterprise DBMS. Data Relay helps developers by simplifying the code that “looks inside” database transactions for changes that should be relayed. It also guarantees maximum efficiency by eliminating the CPU-intensive task of monitoring database activity.

eXtremeDB Data Relay maintains a buffer of eXtremeDB database transactions as they occur. For every object affected by a transaction, there is a code within the buffer that indicates whether the operation was an insert, update, or delete. Developers can use a familiar database “cursor” to iterate over objects in the transaction buffer. If the change in eXtremeDB is of interest (by the application’s criteria), the changes can be propagated to an Oracle, SQL Server, or other backend DBMS.

The new technology also supports an asynchronous mode, in which a transaction can commit on eXtremeDB before changes are saved outside the real-time system. Synchronous data-sharing guarantees consistency between eXtremeDB and the external database, but it ties the eXtremeDB in-memory database to the (slower) performance of the external database. In contrast, the more “relaxed” asynchronous approach largely sustains eXtremeDB’s natural performance. Synchronous Data Relay mode could be useful when eXtremeDB is employed as a predominantly read-only high speed cache to an RDBMS, with occasional updates. Asynchronous Data Relay mode could be useful for classic real-time applications such as financial systems.

eXtremeDB Data Relay provides a convenient, off-the-shelf solution to developers who otherwise would likely code these functions from scratch.

Related Reading

More Insights

Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.